Solar roof is the first product after the strategist alliance between Elon Musk and Solar City. The Share Holders along with Elon Musk voted for this $ 2 Billion deal.
The Detail Specification about the roof are still known, but is believed is installation cost is much less than traditional roof . These Solar roof is a peak into the combined vision of Tesla and SolarCity.
“It’s looking quite promising that a solar roof will actually cost less than a normal roof before you even take the value of electricity into account. So the basic proposition would be, ‘Would you like a roof that looks better than a normal roof, last twice as long, cost less and by the way generates electricity?’ Why would you get anything else?”.
SOURCE : electrek